IP Address

IP addresses are used to specify a computer or network node location so network traffic can be sent to or from that location. IP addresses work like mail house addresses. IP addresses provide enough information so data can be delivered to the computer indicated by the address. IP addresses are broken into 4 octets (IPv4) separated by dots called dotted decimal notation. An octet is a byte consisting of 8 bits. The IPv4 addresses are in the following form:

There are two parts of an IP address:

  • Network ID
  • Host ID

The various classes of networks specify additional or fewer octets to designate the network ID versus the host ID.

Class1st Octet2nd Octet3rd Octet4th Octet
Net IDHost ID
Net IDHost ID
Net IDHost ID